If your LCO is good, go for Alliance. In my area, Alliance LCO enjoys a monopoly. But he is too good. He fixes fibre cuts on the same day. One night (around 12 midnight), there was a fibre cut and he fixed it by 9 AM the next morning. Alliance has been stable overall. In my area, Alliance uses Airtel and
TATA backbone. However, I have not received a TATA backbone for the last 3-4 months. They had provided me with a static IP (free) on TATA backbone with all ports closed for 3-4 months before when there was an issue with upstream. Sometimes, latency increases to
Cloudflare, mainly due to Airtel/ TATA. They cannot do anything about it even if you complain.
Even if Airtel/ Jio comes, I may stick to Alliance, only due to LCO. Only thing is, Alliance charges 300 + GST for static IP, that too NATed and all protocols forwarded. They are fleecing customers. They have bought IPv6, as I saw on peering DB. But they are only peering with TATA and at Extreme iX only on IPv6 (Ipv4 has good peers, don't worry). I hope they start rolling out IPv6 but a support engineer told me they have no plans right now.
One thing: Use their web-based ticket service to lodge any complaint. Their support staff are affable. Otherwise, they take a long time to pick their call.